Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 32: Precision Measurements and Metrology (Optical Clocks)
Q 32.7: Talk
Wednesday, March 11, 2020, 15:30–15:45, a310
Control of mixed Coulomb crystals in a multi-ion clock — •Hartmut Nimrod Hausser, Tabea Nordmann, Jan Kiethe, Leon Schomburg, and Tanja E. Mehlstäubler — Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
The relative uncertainty of a few 10−18 of state-of-the-art single-ion optical clocks paves the way for new applications such as relativistic geodesy, resolving height differences with cm-precision [1] and for the search of physics beyond the standard model, e.g. for dark matter [2]. In order to resolve the atomic frequencies in shorter time the concept of the multi-ion clock was proposed [3]. Here we present the progress towards an 115In+-multi-ion clock. In our approach, we trap 115In+ and 172Yb+ ions in a chip-based linear Paul trap forming a mixed Coulomb crystal. The In+/Yb+-configuration is optimized in terms of cooling time and reproducibility. We present the deterministic loading of a controlled number of In+ and Yb+ ions and reordering after collisions with background gas. Finally, we will discuss the estimated uncertainty of the indium multi-ion clock for our experimental setup.
This project has received funding from the European Metrology Programme for Innovation and Research (EMPIR) co-financed by the Participating States and from the European Union’s Horizon 2020 research and innovation programme (Project No. 17FUN07 CC4C).
[1] T.E. Mehlstäubler et al., Rep. Prog. Phys. 81, 6 (2018).
[2] A. Derevianko, Phys. Rev. A 97, 042506 (2015)
[3] C. Champenois et al., Phys. Rev. A 81, 043410 (2010).